Why does HDMI reduce screen size?

Banzai_Joe · 18 Mar 2010 at 12:57

Hi all,
got an Asus 24" LCD monitor yesterday with VGA, DVI and HDMI.
DVI looks really nice, but when connected to my 4870 (with DVI>HDMI adapter) the screen image becomes slightly smaller with a black border of about 15mm all around, plus the text isn't sharp at all, and no amount of altering in the menus helps this. DVI looks spot on.

I must admit i only tried the one hdmi cable, i do have others i could try, but in the meantime, anyone got any ideas as to why the screens gets reduced, and why its blurry compared to DVI?

Thanks

mame · 18 Mar 2010 at 13:35

Are you mixing up 1920x1200 and 1920x1080 ?

rhysduck · 18 Mar 2010 at 13:42

There a setting in the gpu software/settings. I believe it is called Overscan (Desktop and Displays) in the ATI CCC - I can't check as I'm in work.
Its probably set to 125% or something, drag the slider to the right (or to 100%) to fix this.

Banzai_Joe · 18 Mar 2010 at 13:43

mame said:
Are you mixing up 1920x1200 and 1920x1080 ?

What do you mean? :confused:

The resolution is the same (but you've got me thinking now) for DVI and HDMI. Even so, there is an equal black border all around when in HDMI input, surely it wouldn't be equal if it flicked from one to the other seeing as the horizontal stays the same and only the vertical alters.

Banzai_Joe · 18 Mar 2010 at 13:44

rhysduck said:
There a setting in the gpu software/settings. I believe it is called Overscan (Desktop and Displays) in the ATI CCC - I can't check as I'm in work.
Its probably set to 125% or something, drag the slider to the right (or to 100%) to fix this.

Aaah....ya know what? I've just reinstalled win7 pro, so as yet i've not downloaded the latest catalysts for the 4870 which gives those features. I'll install them and see.
Thanks.

rhysduck · 18 Mar 2010 at 14:24

Took me a while to figure it out with them installed!